| (19) |
 |
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(11) |
EP 2 239 642 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
29.12.2010 Bulletin 2010/52 |
| (43) |
Date of publication A2: |
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13.10.2010 Bulletin 2010/41 |
| (22) |
Date of filing: 13.04.2006 |
|
| (51) |
International Patent Classification (IPC):
|
|
| (84) |
Designated Contracting States: |
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DE FR GB |
| (30) |
Priority: |
14.05.2005 GB 0509898
|
| (62) |
Application number of the earlier application in accordance with Art. 76 EPC: |
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06726762.5 / 1882215 |
| (71) |
Applicant: Rolls-Royce plc |
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London SW1E 6AT (GB) |
|
| (72) |
Inventor: |
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- Brown, Stephen
Derby, Derbyshire DE21 5LF (GB)
|
| (74) |
Representative: White, Kevin Andrew et al |
|
Rolls-Royce plc
Intellectual Property Dep.
PO Box 31
Derby DE24 8BJ
Derby DE24 8BJ (GB) |
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| |
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(57) A further method of analysing measured engine service or test data, in relation to
expected data, from an engine has a plurality of associated system variables, is provided
which includes the step of optimising an error function which relates said measured
data to a predetermined number of the system variables by adjusting the system variables,
wherein the error function is a sum of absolute variations and the step of optimising
includes a least-absolutes optimisation.